As you might be aware, VPN services (ipv4 or IPv6) will be labeled before traversing the MPLS core. In otehr words, there will be 2 labels imposed before traversing the core. bottom label will be VPN labela nd top label will be IGP label to nexthop address (which will be your remote PE address).
In your case, nexthop or remote PE address will IPv6 address which is not currently supported as MPLS enabled on IPv6 core is yet to be supported. You need to enable vpnv6 between IPv4 neighbor.
Can you try the VPNv6 session between IPv4 neighbor?.
but in this case you will have MPLS 6VPE technology if u enable IPV4 in VPNV6 , but I think the 6VPE technology u used it incase u don't have full IPV6 connection in your core but in my case I have full connection IPV6 BGP unicast
Currently we need to use 6VPE if you need VPN service for IPv6. IPv6 in MPLS core is yet to be supported. As mentioned in my previous post, if nexthop is IPv6, we need label assigned to that IPv6 prefix which can be used as top label or IGP label.
LDP for IPv6 is not yet supported. So assigning/advertising a label for IPv6 prefix is not supported yet.
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